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You can skip steps 7-9; there is no need to disconnect any internal wiring or RAM. Crack open the base a couple of inches (it doesn't really rotate, just pull it out), and the PRAM battery will be right under your nose. It's no problem to pop it out with your fingers and put the new one in. Just make sure that you note the positive and negative terminals on the old one, and put the new one in the same way.

There's a post (or block really) that connects the cpu heatsink to the upper part of the metal shell that is just to the right (facing the imac) of the drive door. Upon reassembly it's best to clean the matching surfaces and reapply thermal paste to that upper post.

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It's a bit vague. That is, it explains where and how the memory module fits, but most importantly it does not. What type of DIMM memory it has to be and its speed as well as the process of not touching hands with the gold connectors of the memory module

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This is missing a description of re-doing the thermal paste which connects the heat sinks in the top part with the heat sinks in the bottom part. Check elsewhere on the internet for that (don't look at the other battery replacement guide here on ifixit, that one is criminal in how bad it is, I used to be impressed because that guy had the highest reputation in all of iFixit, now I realized he just gamed the system by putting up zillions of low-quality guides, and letting other people clean up the mess behind him.)

This heat thing is important, as your processor will overheat, and cause your mac to crash randomly.